| 北非和青藏高原感热振荡特征及与我国东部夏季降水的关系 |
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| 引用本文： | 宁亮,钱永甫.北非和青藏高原感热振荡特征及与我国东部夏季降水的关系[J].高原气象,2006,25(3):357-365. |
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| 作者姓名： | 宁亮 钱永甫 |
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| 作者单位： | 南京大学,大气科学系,江苏,南京,210093 |
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| 基金项目： | 国家自然科学基金
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科技部科研项目 |
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| 摘 要： | 利用EOF方法,分析了NCEP/NCAR 1948—2002年再分析资料中月平均全球地面感热资料,揭示了北非和青藏高原感热的振荡特征。分析了振荡关键区的感热距平与我国东部51个测站1951—2000年汛期降水距平的相关关系,用SVD方法分析了关键区感热距平场与我国东部51个测站全年各月降水距平场的空间耦合和时滞关系及关键区感热异常对我国东部降水异常的影响。结果表明,北非和青藏高原两个区域的感热变化呈负相关,它们对我国华北、江淮和华南三个区域的汛期降水滞后影响明显。感热对我国降水的影响以年代际为主。
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| 关 键 词： | 感热振荡 我国东部降水 EOF分析 SVD分析 |
| 文章编号： | 1000-0534（2006）03-0357-09 |
| 收稿时间： | 2005-02-19 |
| 修稿时间： | 2005-02-192005-06-06 |
Oscillation Characteristics of Sensible Heat in North Africa and Qinghai-Xizang Plateau and Their Impacts on the Rainfall in East China |
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| NING Liang,QIAN Yong-fu.Oscillation Characteristics of Sensible Heat in North Africa and Qinghai-Xizang Plateau and Their Impacts on the Rainfall in East China[J].Plateau Meteorology,2006,25(3):357-365. |
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| Authors: | NING Liang QIAN Yong-fu |
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| Institution: | Department of Atmospheric Science, Nanjing University, Nanjing 210093, China |
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| Abstract: | By use of the NCEP/NCAR 1948-2002 reanalysis monthly data of sensible heat flux density,the monthly rainfall data at 51 stations of East China in 1951-2000 and the EOF analysis,the oscillationcharacteristics of sensible heat in North Africa and the Qinghai-Xizang Plateauand their relationship with the rainfall at 51 stations in East China are analyzed.Their spatial coupling patterns and time-lag relationships,as well as the impacts of the sensible heat fields on rainfall are also diagnosed by using the SVD technique.The results show that changes of sensible heat fields in North Africa and over the west of Qinghai-Xizang Plateau are in opposite phase,and both have good time persistence.The sensible heat fields have obvious leading impacts on rainfall in the flood seasons of three regions in East China,including the North China,the Yangtze River drainage areaand the South China with evident decadaland interdecadal variations. |
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| Keywords: | Oscillationof sensible heat Rainfall in East China EOF analysis SVD analysis |
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